[TASK] Remove jQuery from shortcut handling

This patch removes jQuery from the shortcut handling. Also, some minor
refactorings were done:

* use proper events for submit / cancel handling
* submit the form as-is instead of building a custom payload

Resolves: #100099
Releases: main
Change-Id: I25fe414ba7bd8f513f6864a915fec8c75b61a16a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78039


Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Markus Klein <markus.klein@typo3.org>